Your intention is irrelevant, limiting your opportunity is not theft. You're using that analogy as an emotional appeal to present the ip holder as a victim.

Any competitor could limit your opportunity by releasing a functionally similar non infringing product. Would you choose the word 'robbing' in that circumstance?

One would have to use your ip to create a competing product before it would even be copyright infringement, and it still wouldn't be theft since you cannot steal somthing intangible since by definition it only exists as an abstraction which is not the same as zero valued tangible inventory.